public function sparqlQuery($query, $options = array())
{
$resultform = isset($options[Erfurt_Store::RESULTFORMAT]) ? $options[Erfurt_Store::RESULTFORMAT] : Erfurt_Store::RESULTFORMAT_PLAIN;
// Support for FOAF+SSL only when user is authenticated via WebID.
$identity = Erfurt_App::getInstance()->getAuth()->getIdentity();
if (!$identity->isWebId()) {
return parent::sparqlQuery($query, $resultform);
}
$url = $this->_serviceUrl . '?query=' . urlencode((string) $query);
$accept = 'application/sparql-results+xml';
$response = $this->_handleRequest($url, $accept);
$result = $this->_parseSparqlXmlResults($response);
switch ($resultform) {
case 'plain':
$newResult = array();
foreach ($result['results']['bindings'] as $row) {
$newRow = array();
foreach ($row as $var => $value) {
// TODO datatype and lang support
$newRow[$var] = $value['value'];
}
$newResult[] = $newRow;
}
return $newResult;
case 'extended':
return $result;
case 'json':
return json_encode($result);
break;
default:
throw new Exception('Result form not supported yet.');
}
}
/**
* Test if the Erfurt_Store_Adapter_Sparql resolves the graph URI to the correct service.
*/
public function testSparqlWithDbPediaEndpoint()
{
$options = array('serviceUrl' => 'http://dbpedia.org/sparql', 'graphs' => array('http://dbpedia.org'));
$adapter = new Erfurt_Store_Adapter_Sparql($options);
// Use HTTP Client test adapter
$httpAdapter = new Erfurt_TestHelper_Http_ClientAdapter();
$httpAdapter->setResponse(new Zend_Http_Response(200, array('Content-type' => 'application/sparql-results+xml'), file_get_contents($this->_dataDir . 'sparqlDBpediaLeipzig.srx')));
$adapter->setHttpAdapter($httpAdapter);
$sparql = 'SELECT ?p ?o FROM <http://dbpedia.org> WHERE {<http://dbpedia.org/resource/Leipzig> ?p ?o} LIMIT 10';
$result = $adapter->sparqlQuery($sparql);
$serviceUrl = Zend_Uri_Http::fromString('http://dbpedia.org/sparql');
$requestUrl = $httpAdapter->getLastRequestUri();
$this->assertTrue(is_array($result));
$this->assertEquals($serviceUrl->getHost(), $requestUrl->getHost());
$this->assertEquals($serviceUrl->getPath(), $requestUrl->getPath());
$this->assertEquals(10, count($result));
}
